know (something) like the back of (one's) hand

know (something) like the back of (one's) hand

To be extremely familiar with a particular place, subject, or piece of writing, film, music, etc. I've read this book so many times, I know it like the back of my hand. You should ask Samantha for directions—she knows this town like the back of her hand.
See also: back, hand, know, like, of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

know something like the back of your hand

If you know something, especially a place, like the back of your hand, you know it very well. He knows the city like the back of his hand. They were born in the county and knew it like the backs of their hands.
See also: back, hand, know, like, of, something
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

know something like the back of your hand

be entirely familiar with something.
See also: back, hand, know, like, of, something
Farlex Partner Idioms Dictionary © Farlex 2017

know something like the back of your ˈhand

(informal) know a place very well: As a taxi driver, you have to know the city like the back of your hand.
See also: back, hand, know, like, of, something
Farlex Partner Idioms Dictionary © Farlex 2017
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